单项选择题
--The book isn't easy for Jack to understand, is it--（）.His foreign language is far better than expected.
A. No, it isn't B. I'm afraid not C. I don't think so D. Yes, it is
单项选择题 They paid（）money for the machine than I expected.
单项选择题 So seriously（）in the accident that he was sent to hospital at once.
